fix(eve): prioritize current hook deliveries over stale backlog

[iroiro147]

Summary

• split session delivery backlog into turn-owned, current-hook, and replaced-hook queues
• classify ready hook reads before selecting the next delivery, so current live input runs before older replaced-hook backlog
• preserve turn-control cancellation/rebuffer ordering and keep the active hook current when a candidate rekey claim fails

Refs #547.

Tests

• pnpm --filter eve exec vitest run --config vitest.unit.config.ts src/execution/session-delivery-hook.test.ts src/execution/workflow-entry.test.ts src/execution/turn-control-receiver.test.ts src/execution/turn-dispatch.test.ts
• pnpm --filter eve exec vitest run --config vitest.integration.config.ts src/execution/session-delivery-hook.integration.test.ts
• pnpm --filter eve typecheck
• pnpm changeset status --since origin/main
• git diff --check

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[iroiro147]

Superseded by verified rebased replacement #1402 (rebuilt on current main, MERGEABLE): #1402 — closing this stale conflicting PR in favor of the new one.